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安徽灵壁地震台的测震摆房在距记录室300m 的山脚下。300m 摆线为8芯电缆。1984年10月以后在标定时发现拾震器空气阻尼 D_(10)的值在不断增大,历次仪器标定时 D_(10)的值见表1,无阻尼状态自由振荡的记录波形见图1。脉冲检查也发现仪器放大倍率相对变化多次超过15%。1985年10月进行仪器标定时发现拾震器 D_(10)的 EW 分向最大达到0.08198,好象在回路中并连了一个300kΩ的阻尼电阻在起阻尼作用。为了解决这个问题我们采取了以下措施。
The seismic shaking room at Lingbi Seismic Station in Anhui Province is located at the foot of 300m away from the recording room. 300m cycloid for the 8-core cable. After calibration in October 1984, it was found that the value of D_ (10) of the air damping of the pickup increased continuously. The values of D_ (10) at the time of calibration of the instrument are shown in Table 1. The undisturbed free- . Pulse inspection also found a relative change in instrument magnification of more than 15% many times. In October 1985, it was found that the EW of the pickup D_ (10) reaches a maximum of 0.08198 when calibrating the instrument. It seems that a damping resistance of 300kΩ is connected to the loop to damp the EW. In order to solve this problem we have taken the following measures.